source4/scripting/python/samba/external.py

   1 #!/usr/bin/python
   2
   3 # Unix SMB/CIFS implementation.
   4 # Copyright (C) Andrew Tridgell 2010
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 #
  19
  20 import os, sys
  21
  22 def dns_resolver():
  23     '''try and import the dns.resolver library, and if it fails
  24     then use a local copy from the external directory'''
  25
  26     try:
  27         import dns.resolver as dns
  28     except ImportError:
  29         sys.path.insert(0, os.path.join(os.path.dirname(__file__), "../../../../lib/dnspython"))
  30         import dns.resolver as dns
  31     return dns